Can a small hiatal hernia cause stuck food / loose stools and gerd? I had to go to ER becuase chicken was stuck, said I had hernia and inflammation.

Yes. Hiatal hernia and grrd go together. Food stuck because the acid caused inflammation. You need to get this fixed.
Yes and no. Inflammation at the transition zone between esophagus and stomach can result in luminal (phenobarbital) narrowing and impede food transit. Yes, food may get stuck here. Even a small hiatal hernia can contribute to reflux injury hence be partially responsible for causing the food to stick. Most small hiatal hernias dont need surgical correction. Loose bm - not generally associated with reflux problem.